Circuit-detecting device.



No. 850,258. PATENTED APR.16, 1901. L. M.. SCHMIDT;

CIRCUIT DETECTING DEVICE.

APPLIOATION FILED 0013.8, 1904.

Witnesses:

. UNITED STATES PATENT OFFICE;

.LOUIS M. SCHMIDT, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

CIRCUIT-DETECTING DEVICE.

I No. 850,258.

Specification of Letters Patent.

latented April 16, 1907.

Application filed October 8. 1904. Serial No. 227,645.

To all whom it may concern.-

Be it known that I, Louis M. SCHMIDT, a

citizen of the United States, residing atLynn,

, county of Essex, State of Massachusetts,

5 have invented certain new and useful Improvements in Circuit-Detecting Devices, of which the following is ,a specification.

My invention relates to electrical testing devices; and its object is to provide a device for detecting the presence of alternating current in conductors which is cheap, compact, and readily applied to conductors of various sizes. A

My invention will best be understood by reference to the accompanying drawings, in WlllGll- Figure 1 shows side elevation of the de vice constructed in accordance with my in-' vention, and Fig. 2 shows a plan view of the same.- j

1n the drawings, A represents a laminated U-shaped core the inner sides of'which are sloped at an angle to each other, as shown, so as to receive conductors of various sizes. The core A is provided with a handle B and carries at the base of the'U acoil C, provided with the terminals 0 c. To these terminals may be connected any suitable electroresponsive device Das, for instance, a telephone-receiver. When the U-shaped core is slipped over the conductor E, shown, an alternating flux will be produced in the core if the conduetor is carrying alternating current, and this flux will produce in the coil C an alternating curent, which may be detected by means of the telephone-receiver or other electrical device, such as a voltmeter.

What 1 claim as new, and desire to secure by Letters Patent of the United States, is

In a current-detecting device, a laminated U-shaped core having its inner sides diverging from the base of the U to accommodate conductors of difl'erent sizes, a handle attached. to the base of said core, a winding carried by said core at the base of the U, and an electroresponsive device connected in series with said Winding. I

In Witness whereof I have hereunto set my hand this 5th day of October, 1904.

LOUIS M. SCHMIDT. 

